The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 1990
Filed:
May. 13, 1988
Applicant:
Inventors:
Mamoru Ishiguro, Takasago, JP;
Yoshihide Murakami, Takasago, JP;
Assignee:
Mitsubishi Paper Mills, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
264-47 ; 42721334 ; 42840221 ;
Abstract
A method for producing microcapsules with an aminoaldehyde polycondensate as a wall material in an aqueous medium containing a water-soluble polymer is disclosed. As the water-soluble polymer, there is used a terpolymer comprising (A) .alpha.-methylstyrene, (B) styrene and (C) maleic anhydride or a quadripolymer comprising (A) .alpha.-methylstyrene, (B) styrene, (C) maleic anhydride and (D) an esterification product of maleic anhydride. This method is especially useful for making pressure-sensitive copy paper.